Sony Ultra wide conversion lens VCL-ECU1 - Any users?

I have purchased a NEX-5 kit with 16/18-55 lenses. I am a W/A shooter and will want to go beyond 16mm. I notice that Sony UK have the Sony Ultra wide conversion lens VCL-ECU1 up but not available yet here. As I understand it this is a 0.75 reduction lens yielding an 18mm imagein 35mm format. Ideal for me if IQ is OK.

It can be got from Hong Kong suppliers on ebay. I would like one but not until I have read reports from users.

Any users here? If so please advise on your experience and the IQ both at centre and corners. I am interested in reports on how 100% views of Jpegs and RAWs look as I submit to Internet photo libraries.
Thanks in advance.